In addition to knowing the chemical structures of the nucleotides,Watson and Crick used ________ of Franklin and Wilkins and the chemical equivalencies of Chargaff in order to propose their model of DNA structure.
A)sequence information
B)UV spectra
C)% (G +C)and % (A +T)
D)X-ray diffraction data

Question

Quizplus · Accepted Answer

Watson and Crick used X-ray diffraction data, specifically the X-ray crystallography images produced by Rosalind Franklin and Maurice Wilkins, to propose their model of DNA structure. They also incorporated the chemical equivalencies observed by Erwin Chargaff, which showed that the amounts of guanine (G) and cytosine (C) and the amounts of adenine (A) and thymine (T) in DNA are roughly equal. While sequence information and UV spectra can provide useful information about DNA, they were not the primary sources of data used by Watson and Crick in proposing their model.

In Addition to Knowing the Chemical Structures of the Nucleotides,Watson